This document discusses the Schottky diode, a semiconductor diode with a low forward voltage drop and very fast switching speeds. It forms a metal-semiconductor junction, using a metal like molybdenum or platinum in contact with an N-type semiconductor like silicon. This creates a Schottky barrier and results in fast switching without the charge storage and recovery time of a conventional PN junction diode. Key advantages are voltage drops as low as 0.15V, no reverse recovery time, and operation at frequencies from MHz to GHz. Applications include rectification, switching, and protection circuits.
The three terminals of the FET are known as Gate, Drain, and Source.
It is a voltage controlled device, where the input voltage controls by the output current.
In FET current used to flow between the drain and the source terminal. And this current can be controlled by applying the voltage between the gate and the source terminal.
So this applied voltage generate the electric field within the device and by controlling these electric field we can control the flow of current through the device.
Introduction to Semiconductor Devices.
In modern world no other technology permeates every nook and cranny of our existence as does electronics.
Application of electronics are : Televisions, radios, stereo equipment, computers, scanners, electronic control systems (in cars for example) etc.
This ppt is about semiconductor diodes.You can get every basic information about PN junction diode and its working and some more information about the semiconductors.
Pn junction diode by sarmad baloch
I AM SARMAD KHOSA
BSIT (5TH A)
(ISP)
FACEBOOK PAGLE::
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YOUTUBE CHANNEL:::
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This video contains
Introduction,
Structure,
Working Principle,
Band Diagram,
I-V AND C-V Characteristics,
MOSFET Breakdown,
Subthreshold condition,
Buried Channel MOSFET,
Advantages and Disadvantages,
Applications.
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET). It has an insulated gate, whose voltage determines the conductivity of the device. This ability to change conductivity with the amount of applied voltage can be used for amplifying or switching electronic signals. Although FET is sometimes used when referring to MOSFET devices, other types of field-effect transistors also exist.
A silicon-controlled rectifier or semiconductor-controlled rectifier is a four-layer solid-state current-controlling device. Some sources define silicon-controlled rectifiers and thyristors as synonymous,[5] other sources define silicon-controlled rectifiers as a proper subset of the set of thyristors. SCRs are mainly used in devices where the control of high power, possibly coupled with high voltage, is demanded. Their operation makes them suitable for use in medium- to high-voltage AC power control applications, such as lamp dimming, power regulators and motor control.
The basics of electronics can be watched through the link http://bit.ly/2PPv0mv
A Diode is a semiconductor device with two terminals, typically allowing the flow of current in one direction only.
a thermionic valve having two electrodes (an anode and a cathode).
The three terminals of the FET are known as Gate, Drain, and Source.
It is a voltage controlled device, where the input voltage controls by the output current.
In FET current used to flow between the drain and the source terminal. And this current can be controlled by applying the voltage between the gate and the source terminal.
So this applied voltage generate the electric field within the device and by controlling these electric field we can control the flow of current through the device.
Introduction to Semiconductor Devices.
In modern world no other technology permeates every nook and cranny of our existence as does electronics.
Application of electronics are : Televisions, radios, stereo equipment, computers, scanners, electronic control systems (in cars for example) etc.
This ppt is about semiconductor diodes.You can get every basic information about PN junction diode and its working and some more information about the semiconductors.
Pn junction diode by sarmad baloch
I AM SARMAD KHOSA
BSIT (5TH A)
(ISP)
FACEBOOK PAGLE::
https://www.facebook.com/LAUGHINGHLAUGHTER/
YOUTUBE CHANNEL:::
https://www.youtube.com/channel/UCUjaIeS-DHI9xv-ZnBpx2hQ
This video contains
Introduction,
Structure,
Working Principle,
Band Diagram,
I-V AND C-V Characteristics,
MOSFET Breakdown,
Subthreshold condition,
Buried Channel MOSFET,
Advantages and Disadvantages,
Applications.
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET). It has an insulated gate, whose voltage determines the conductivity of the device. This ability to change conductivity with the amount of applied voltage can be used for amplifying or switching electronic signals. Although FET is sometimes used when referring to MOSFET devices, other types of field-effect transistors also exist.
A silicon-controlled rectifier or semiconductor-controlled rectifier is a four-layer solid-state current-controlling device. Some sources define silicon-controlled rectifiers and thyristors as synonymous,[5] other sources define silicon-controlled rectifiers as a proper subset of the set of thyristors. SCRs are mainly used in devices where the control of high power, possibly coupled with high voltage, is demanded. Their operation makes them suitable for use in medium- to high-voltage AC power control applications, such as lamp dimming, power regulators and motor control.
The basics of electronics can be watched through the link http://bit.ly/2PPv0mv
A Diode is a semiconductor device with two terminals, typically allowing the flow of current in one direction only.
a thermionic valve having two electrodes (an anode and a cathode).
A tunnel diode or Esaki diode is a type of semiconductor that is capable of very fast operation, well into the microwave frequency region, made possible by the use of the quantum mechanical effect called tunneling.
It was invented in August 1957 by Leo Esaki when he was with Tokyo Tsushin Kogyo, now known as Sony. In 1973 he received the Nobel Prize in Physics, jointly with Brian Josephson, for discovering the electron tunneling effect used in these diodes. Robert Noyce independently came up with the idea of a tunnel diode while working for William Shockley, but was discouraged from pursuing it.[1]
These diodes have a heavily doped p–n junction only some 10 nm (100 Å) wide. The heavy doping results in a broken bandgap, where conduction band electron states on the n-side are more or less aligned with valence band hole states on the p-side
Tunnel diodes were first manufactured by Sony in 1957[2] followed by General Electric and other companies from about 1960, and are still made in low volume today.[3] Tunnel diodes are usually made from germanium, but can also be made from gallium arsenide and silicon materials. They are used in frequency converters and detectors.[4] They have negative differential resistance in part of their operating range, and therefore are also used as oscillators, amplifiers, and in switching circuits using hysteresis.
Figure 6: 8–12 GHz tunnel diode amplifier, circa 1970
In 1977, the Intelsat V satellite receiver used a microstrip tunnel diode amplifier (TDA) front-end in the 14 to 15.5 GHz band. Such amplifiers were considered state-of-the-art, with better performance at high frequencies than any transistor-based front end.[5]
The highest frequency room-temperature solid-state oscillators are based on the resonant-tunneling diode (RTD).[6]
There is another type of tunnel diode called a metal–insulator–metal (MIM) diode, but present application appears restricted to research environments due to inherent sensitivities.[7] There is also a metal–insulator–insulator–metal MIIM diode which has an additional insulator layer. The additional insulator layer allows "step tunneling" for precise diode control.[8]
Resonant-tunneling-diode effect in Si-based double-barrier structure sputtere...IJRES Journal
This paper presents the resonant-tunneling-diode (RTD) effect in a SiO2/n-Si/SiO2/p-Si double-barrier structural thin films fabricated using radio frequency (RF) magnetron sputtering at room temperature (300 K). The implementation of a circuit prototype is first accomplished by modulating a Si-based RTD with a solar-cell bias voltage. The important electrical properties of the peak current density and peak-to-valley current ratio (PVCR) are 184 nA/cm2 and 1.67, respectively. The connection between the two RTDs in series is biased by a solar cell. The value of the switching transition time is 24.37 μs; oscillation occurs with an operating frequency of 41.6 KHz. In semiconductor applications, the developed RTD is characterized by stability, enduring environmentally elevated temperature and relative humidity.
Electrical current, voltage, resistance, capacitance, and inductance are a few of the basic elements of electronics and radio. Apart from current, voltage, resistance, capacitance, and inductance, there are many other interesting elements to electronic technology. ... Use Electronics Notes to learn electronics online.
Electron Device Control Lecture All Need To Know The Basics Of Device Control? Look At This.. Based On Basic Concepts..
By Anna University Syllabus..
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Type of all_kind_of_diode.zenzer_diode_p-n_junction_diode_pin_diode_led_diode...Robioul Hasan
Type of all_kind_of_diode.zenzer_diode_p-n_junction_diode_pin_diode_led_diode_tunnel_diode_vractor_diode_schottky_diode_photo_diode_avalanche_diode_laser_diode
Types of DIODES Basic electronics by sarmad khosaSarmad Baloch
Types of DIODES Basic electronics by sarmad khosa
I AM SARMAD KHOSA
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Researchers like Landauer and Bennett have shown that every bit of information lost will generate kTlog2 joules of
energy, whereas the energy dissipation would not occur, if computation is carried out in a reversible way. k is
Boltzmann’s constant and T is absolute temperature at which computation is performed. Thus reversible circuits will be
the most important one of the solutions of heat dissipation in Future circuit design. Reversible computing is motivated
by the Von Neumann Landauer (VNL) principle, a theorem of modern physics telling us that ordinary irreversible logic
operation which destructively overwrite previous outputs)in cur a fundamental physics) that performance on most
applications within realistic power constraints might still continue increasing indefinitely. Reversible logic is also a
core part of the quantum circuit model
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
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Role of Ethnopharmacology in drug evaluation,
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Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
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Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
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In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
2. SCHOTTKY BARRIER DIODE
•The Schottky diode (named after German physicist Walter H.
Schottky; also known as hot carrier diode) is a semiconductor diode
with a low forward voltage drop and a very fast switching action.
•When current flows through a diode there is a small voltage drop
across the diode terminals. A normal silicon diode has a voltage drop
between 0.6–1.7 volts, while a Schottky diode voltage drop is
between approximately 0.15–0.45 volts. This lower voltage drop can
provide higher switching speed and better system efficiency.
3. CONSTRUCTION
A metal–semiconductor junction is formed between a metal and a
semiconductor, creating a Schottky barrier (instead of a
semiconductor–semiconductor junction as in conventional diodes).
Typical metals used are molybdenum, platinum, chromium or
tungsten; and the semiconductor would typically be N-type
silicon.
The metal side acts as the anode and N-type semiconductor acts
as the cathode of the diode. This Schottky barrier results in both
very fast switching and low forward voltage drop.
Metal N-type
material
5. WORKING
The electrons of N-side having low energy level than
that of metal . So electrons cant cross the junction
barrier called
schottky barrier.
In Forward bias the electrons in N side gain enough
energy to cross the junction barrier and plunge into the
metal with very large energy .They are called it hot
carriers and diode is called hot carrier diode.
5
7. REVERSE RECOVERY TIME
The most important difference between the p-n and
Schottky diode is reverse recovery time, when the diode
switches from conducting to non-conducting state. Where
in a p-n diode the reverse recovery time can be in the
order of hundreds of nanoseconds and less than 100 ns
for fast diodes, Schottky diodes do not have a recovery
time, as there is nothing to recover from (i.e. no charge
carrier depletion region at the junction).
8. SOME IMPORTANT POINTS ABOUT SCHOTTKY DIODE
Schottky diode is metal to semiconductor junction.
Schottky diode is a majority carrier device unlike to normal pn
junction diode
It does not have charge storage region there for very fast
speed
Semiconductor used is usually N-type.
Semiconductor region is lightly doped.
It is operated at high frequencies from few MHZ to GHZ range.
9. LIMITATIONS
The most evident limitations of Schottky diodes are
the relatively low reverse voltage ratings for silicon-
metal Schottky diodes, typically 50 V and below, and
a relatively high reverse leakage current. Some
higher-voltage designs are available; 200V is
considered a high reverse voltage.
Reverse leakage current, because it increases with
temperature, leads to a thermal instability issue. This
often limits the useful reverse voltage to well below
the actual rating.
While higher reverse voltages are achievable, they
would be accompanied by higher forward voltage
drops, comparable to other types; such a Schottky
diode would have no advantage
10. APPLICATIONS
Voltage clamping and clipping circuits
Reverse current and discharge protection
Rectify high frequencies signal.
Low power TTL logic.
As a switching devices.
10